private void button_Click(object sender, RoutedEventArgs e)
        {
            GerberFile gerber = mGerbers[cbGerber.SelectedIndex];
            CadFile    cad    = mCads[cbCad.SelectedIndex];;

            System.Drawing.Point cGerber = gerber.GetCenterPadsSelected();
            System.Drawing.Point cCad    = cad.GetCenterSelected();
            if (cGerber != new System.Drawing.Point() && cCad != new System.Drawing.Point())
            {
                int subx = cGerber.X - cCad.X;
                int suby = cGerber.Y - cCad.Y;
                cad.X += subx;
                cad.Y += suby;
                mGerberToolsWindow.ShowAllLayerImb(ActionMode.Draw_Cad);
            }
            else
            {
                MessageBox.Show(string.Format("Please select item on the layers selected..."), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }